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Supplemental Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Supplemental Cash Flow Information [Line Items]
Interest paid	$ 364,507	$ 312,992
Income taxes paid	3,092	4,343
Assets acquired through capital leases and installment sales	21,139	20,213
Conversion of redeemable convertible preferred stock (note 7)	$ 305,180	$ 0

The value of the stock converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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